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两相流质量流量和质量含汽率的测量是反应堆失水事故试验的重要课题。两相流流过节流装置时产生的差压测量噪音是由于相浓度在空间的随机分布所引起的。本文假设分散相浓度分布的方差正比于其平均相浓度,应用两相流分离流理论模型论证了节流装置差压方根噪音的方差近似正比于分散相流量,进而推导出利用噪音测量两相流质量流量和干度的理论模型。这一论证预示了可以根据简单的理论模型用单一节流装置实现两相流流量和干度的双参数测量。
The measurement of mass flow and mass vapor content of two-phase flow is an important issue in the experiment of reactor water loss accident. Differential pressure measurements of two-phase flow through the throttling device are caused by the random distribution of phase concentrations in space. This paper assumes that the dispersion of the dispersed phase concentration distribution is proportional to its average phase concentration. The two-phase flow model is used to demonstrate that the variance of the root mean square noise of the differential pressure device is approximately proportional to the dispersed phase flow rate, The theoretical model of flow mass flow and dryness. This argument predicts that a two-parameter measurement of two-phase flow and dryness can be achieved with a single throttling device based on a simple theoretical model.